I have a very sensitive lungs (severe chronic lifelong asthmatic) and have found that mouth pulls and degummed hemp fiber filters create a very smooth, cool, non irritating vapour. With the VapCap using these techniques I never experience not harsh Vapor and never cough.
Take a few inches of degummed hemp fiber.
Moisten one end and wind it like you are preparing to thread a needle. Place it between your thumb and index finger and wind it round and round between your two fingers to create a flat round filter.
Stuff this into the bottom of your bowl. This filter will effectively remove any tiny particles that may otherwise pass through your screen, into the airpath and into your lungs. It also keeps your condenser surprisingly clean and clear of debris.
The mouth pull technique provides a cooler fresher vapor inhale. Dial down to a tight air restriction and cover the air port for most of the toke. Pull the vapor into your mouth without inhaling, like you would when puffing on a cigarette or cigar. Near the end of the pull, open or feather the air port to bring the vapor into your mouth along with that pulse of fresh cool air, or open your mouth, remove the Vapcap and inhale the vapour and fresh air into your lungs. Exhale. Repeat.
Use a filter. Take short mouth pulls versus long tokes and incorporate fresh air.
This technique, for me, gets me where I want to be with no lung irritation. It is the smoothest, coolest vapor I have ever experienced in a vape. Because of this and all the other inherent characteristics of this ingenious device, my VAS is now only focused on Dynavap parts and accessories.
If you experience lung irritation, get a VapCap and try this technique.